Question

A train moves with a speed of 50 km/hr in the first 15 min with another speed of 40 km/ hr in the
next 15 min & then with a speed of 60km/hr in the last 30 min. Calculate the average speed of the train for this journey.​

Answer 1

Answer:

Given train travels 12 minutes with speed 30 km \hr

Then train travels =

60

30

×12=6km

And train travels 8 minutes with speed 45 km\ hr

Then train travels =

60

45 ×8=6km

Then train travels distance in 12+8=20 minutes =6+6=12 km

Then average speed =

20

12 ×60=36 km \hr

Answer 2

Step-by-step explanation:

Media

all WifE

87)

Value of the middlemost observation.

• If n(number of observations) is odd, Median =[(n+1)/2]th observation.

• If n is even, the Median is the mean or average of (n/2)th and [(n+1)/2]th observation.

Mode

• The most frequently occurring observation is called the mode.

• The class interval with the highest frequency is the modal class